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FAQs on CHAPTER 4 - MATERIALS : METALS AND NON METALS - PPT, Science, Class 8

1. What are metals and non-metals?
Ans. Metals are elements that are typically shiny, malleable, ductile, and good conductors of heat and electricity. They tend to lose electrons and form positive ions when they undergo chemical reactions. Non-metals are elements that are typically dull, brittle, and poor conductors of heat and electricity. They tend to gain electrons and form negative ions when they undergo chemical reactions.
2. What are some examples of metals and non-metals?
Ans. Examples of metals include iron, copper, gold, silver, aluminum, and zinc. Examples of non-metals include carbon, sulfur, nitrogen, oxygen, and chlorine.
3. What are the properties of metals and non-metals?
Ans. Metals have the following properties: they are typically shiny, malleable, ductile, and good conductors of heat and electricity. They tend to lose electrons and form positive ions when they undergo chemical reactions. Non-metals have the following properties: they are typically dull, brittle, and poor conductors of heat and electricity. They tend to gain electrons and form negative ions when they undergo chemical reactions.
4. How are metals and non-metals used in our daily lives?
Ans. Metals are used in our daily lives in a variety of ways. For example, iron is used to make construction materials such as steel beams, copper is used to make electrical wiring, and gold and silver are used to make jewelry. Non-metals are also used in our daily lives. For instance, we breathe oxygen to survive, nitrogen is used to make fertilizers, and sulfur is used to make matches.
5. What is the difference between a metal and a non-metal?
Ans. The main difference between a metal and a non-metal is their physical and chemical properties. Metals tend to be shiny, malleable, ductile, and good conductors of heat and electricity, while non-metals tend to be dull, brittle, and poor conductors of heat and electricity. Metals also tend to lose electrons and form positive ions when they undergo chemical reactions, while non-metals tend to gain electrons and form negative ions.
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